Originally Posted by
michaelmah
the previous batch crs did superman for 2-3 day then 4th day become mummy.
Is it possible that they just molted, and the "mummy" is the old shell? While still soft, they are very good at hiding.
Originally Posted by
michaelmah
Now I know superman , seem to be water parameter problem and they strees by that cause.
Now I hope there are fine because I can only see 3 out 6 crs in my nano tank.
Ph to plant, this I not very sure.
ANy expert help to voice up
Plants, fish, and most inverts cannot really feel pH and are not strongly affected. Can you feel the pH when you go swimming? Well, neither can they.
Plants and fish are pretty comfortable at any pH between 4 and 10, but may not reproduce well in the wrong range. I don't know about shrimp, but suspect they are about the same.
That said, a change in pH can cause ammonia poisoning as harmless ammonium changes to deadly ammonia if pH is suddenly raised above about 7.5. You probably have almost no ammonia if you have a well-planted tank. [This is the main source for the old "pH shock" myth so popular among fish atlas authors who know no chemistry.]
At low pH, fish can get "brown blood" disease which is nitrite poisoning (sometimes called acidosis). Usually it is only when overcrowded and polluted. Again, clean water and there's no pH problem.
The real problem is not the pH, but the total dissolved solids (tds). They determine the osmotic pressure across skin and gill cell walls. Sudden changes in tds can cause real damage. Fish have a complex, three-level system for keeping fresh water from rushing into surface cells and making them burst. Suddenly dunking a fresh-water fish in sea water is less deadly, as that mostly just dehydrates the cells until the osmotic regulation can adjust.
If you drop the tds by a factor of more than 2, serious damage is likely, and opportunistic infections will get into the damaged cells. Death usually follows, sometimes right away, but usually after some days of being sick.
In tiny fish the adjustment takes as little as 15 minutes or so. Large anadromous fish, like salmon, hang at the river mouth for a day or more before swimming upstream to spawn. In any case, we must always make changes in the dissolved solids a slow enough process that the fish (or plants) can adjust.
I have no idea how sensitive shrimp are to tds change, but I would guess they have some need for acclimation, too.
BTW, coral or shells add hardness as well as raise pH. The buffer system there is Calcium Carbonate and Calcium Bicarbonate. You can get better results and not increase hardness by using common baking soda, Sodium Bicarbonate, to buffer the water into the high 7s. For the life of me I cannot imagine any real reason you would want to do this.
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